1The country was explored.
2A new factory will be built.
3The letters were posted yesterday.
4The truth will be told.
5He must be immediately sent for.
6He has just been sent for.
7The crops can be picked by machines.
8Roads were constructed by people.
9More raw materials are needed for industry.
10More goods will be produced.
11They were shown the way. (The way was shown.)
12He was taught English.
13I was given money.
14She was taken to hospital.
15I was offered a cup of tea.